K final drive

[thebob]

Ok, from everything im told the JDM K20A has a 4.7 FD. Im going to get rid of the FD and upgrade it as i will have the tanny out of the car. The car is a circut street car but by no means daily driver.

My 2 options are
Spoon 5.1 - $650ish from nengun
OEM honda 5.062 - $460 from JHPUSA.

Im leaning towards the OEM one due to the lower FD and price. Also wondering what car did the 5.062 come out of.

[wuism]

spoon FD is OEM one btw...
it just comes in a spoon box and i know this.. coz i bought one.
spoon is also 5.062 = 5.1 rounded up.
if consider a 5.4 FD if ur not DD, as 5.1 for DD aint that bad.

[thebob]

5.4 is a bit to extreme i think. Who did you buy yours through.
rep point

[wuism]

i got mine overseas...
6.33 FD is extreme... ahahaha
http://www.youtube.com/watch?v=BLMQ6lGxCe8

dont forget to by the bearing as well.
so 3 parts.
ring gear
countershaft
bearing for the countershaft

[free2d]

I think Spoon one is lighter than oem

[thebob]

Where could you shave weight out of the FD?

[barefootbonzai]

just go the oem one bobby. i believe it comes out of the CRV in the US or JPN.

[DR HONDA]

Ok, from everything im told the JDM K20A has a 4.7 FD. Im going to get rid of the FD and upgrade it as i will have the tanny out of the car. The car is a circut street car but by no means daily driver.

My 2 options are
Spoon 5.1 - $650ish from nengun
OEM honda 5.062 - $460 from JHPUSA.

Im leaning towards the OEM one due to the lower FD and price. Also wondering what car did the 5.062 come out of.
5.062 belongs to the FN2R. Will work fine on 2.0litred engines along with a 5.3 fd. 2.4litred engines wont like anything higher than 4.7.

[thebob]

Thanks for the info everyone.

[thebob]

Just like to give a quick update. Got a 5.062 OEM FD for $400 us shipped. God bless the USA!

[fatboyz39]

damn good price.. got a link?

[thebob]

http://www.k20a.org/forum/showthread.php?p=467572#post467572

[Euro08Jaz]

Sorry to ask in you thread but is 4.7 final drive the best way to go for a euro, why is getting anything higher a bad idea?

[markoJEK1]

Higher the final drive the quicker the acceleration and more torque is produced.

The down side is that its not good for highway driving or any sort of high speed driving over long periods of time, as your rpm @ 100 km/h will be increased dramatically = more fuel consumption etc etc

And as mentioned for a 2.4L a 4.7 FD is the optimum

[Euro08Jaz]

Thanks for the reply, wwould you happen to know what the revs would be sitting at 80ks or 110 in a 6 speed manual with a 4.7 final drive?

[90LAN]

Higher the final drive the quicker the acceleration and more torque is produced.

The down side is that its not good for highway driving or any sort of high speed driving over long periods of time, as your rpm @ 100 km/h will be increased dramatically = more fuel consumption etc etc

And as mentioned for a 2.4L a 4.7 FD is the optimum

nah not true marko a member on here gets 730 kms out of 38lts with a b18cr with a 4.78 fd in a eg

[Euro08Jaz]

It makes sense in theory though higher revs= greater fuel consumption and i assume that having too low of a revs not only increases engine wear but increased fuel consumption do to lack of momentum?

[aaronng]

It makes sense in theory though higher revs= greater fuel consumption and i assume that having too low of a revs not only increases engine wear but increased fuel consumption do to lack of momentum?

Fuel consumption depends on throttle position (your foot and your desired acceleration), engine load (up/downhill, gearing, desired acceleration) and other smaller effects like air temperature and altitude. With a shorter final drive, you rev higher, but the engine load is decreased. So to maintain a certain speed, you will need less throttle application up to a point. So even if you were in 5th gear revving say 3500rpm (with the shorter final drive) instead of 3000rpm (stock) on the freeway, the 3500rpm can give better lower consumption than 3000rpm IF at 3000rpm, the load on the engine is too high (heavy car, head wind, wind resistance, uphill) for the torque produced with the longer final drive.

[thebob]

Thanks for the reply, wwould you happen to know what the revs would be sitting at 80ks or 110 in a 6 speed manual with a 4.7 final drive?


Pretty sure its 3200 at 100kph. With the 5.1 its 3900 at 100kph on 15's.